Reconnect to VPNs, as unstable connections often trigger this error.
I’ve been using RDP for years, but hitting was a new level of vague troubleshooting. The connection fails immediately during the “Securing remote connection” phase. No helpful message from Microsoft—just these codes.
: Test the connection using the host's IP address rather than its DNS name to rule out name resolution issues. Use the command Test-NetConnection [IP] -Port 3389 in PowerShell to verify the port is open.
Windows Defender or third-party antivirus (like Bitdefender ) blocking mstsc.exe or port 3389.
The self-signed RDP certificate on the remote server has expired and failed to renew. Reconnect to VPNs, as unstable connections often trigger
Misconfigured WMI settings can prevent the certificate service from working correctly.
This specifies that the failure happened during the network transmission or Transport Layer Security (TLS) handshake phase .
If none of the above works, you need telemetry.
Are you connecting to a or a cloud-based VM (like Azure or AWS) when this error occurs? Unable to RDP into some Windows Servers - Error code: 0x904 No helpful message from Microsoft—just these codes
: If this were an Azure VM, the story might have involved a corrupt MachineKeys folder. A quick rename of that folder via a PowerShell script would have cleared the path for a new certificate to be born.
. It often occurs when the client and server cannot establish a stable session due to network instability or mismatched encryption certificates. 🔍 Root Cause Analysis Network Instability:
Find .
: If the TermService (Remote Desktop Service) or NETWORK SERVICE account loses read permissions to the host machine's machine keys, it cannot establish an encrypted tunnel. If the problem continues
Less common but diagnostically important, some firewalls or Network Address Translation (NAT) devices use aggressive timeouts for idle or "half-open" connections. If the RDP handshake takes too long—due to network latency or slow disk I/O on the server—the firewall may inject a TCP Reset packet (RST). This reset manifests as extended error 0x7, and the server’s incomplete license negotiation logs as 0x904.
As the morning wears on, the plot thickens. The network is fine. The firewall is open. The admin realizes that while they can connect to nine servers, the tenth is stubbornly locked.
When this error strikes, you are met with a standard Windows dialog box stating: "This computer can't connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator." Clicking the "See details" dropdown reveals the frustrating underlying technical values: and Extended error code: 0x7 .